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Lonesome George Is Dead At 100
New submitter camperdave writes "Lonesome George, the last remaining tortoise of his kind and a conservation icon, died on Sunday of unknown causes, the Galapagos National Park said. He was thought to be about 100 years old."
Was his DNA sequenced? Has any of his genetic material been preserved? It would really be sad if the best we can offer the last specimen of such a magnificent species is a spot in a museum display case for his carcass.
Yes, but you don't suddenly drop dead from being old. There's generally a specific medical cause.
...also, another point of pedantry: it was suspected he was at least a hundred. It was theorized that may have been much older, perhaps closer to 200 than 100. Turtles are so damn rugged and scaly that it's impossible to really tell just by observation. Dying at the age of one hundred would actually have been a little premature for a Galapagos tortoise, equivalent to probably 60 or 65ish for a human, I think.
Bio questions? Ask me to start a Q&A journal. Computer analogies available for most topics!
Sorry, but breeding is not a definitive black and white for species. That two populations can interbreed and produce fertile offspring does not automatically make them the same species (grizzly bears and polar bears), any more than an inability to interbreed means they're not (ie. chihuahuas and Great Danes).
The species concept is considerably more complex than inter fertility, and is really a spectrum of traits that will always be somewhat subjective. Nature doesn't follow nice clean Linnean lines.
The world's burning. Moped Jesus spotted on I50. Details at 11.
I just sorta had my butt handed to me on that question, so I may not be the best person to consult about the basics of taxonomy. I do however believe there ought to be a disclaimer somewhere at the start of every genetics textbook that goes something to the tune of "don't ask about plants and ploidy, you'll never be satisfied with the answer."
But to make a long story short, I would actually map the different ploidies of dandelions to something like sexes. Organisms adopt some heinously bizarre techniques for managing population size when they're wildly successful, and it sounds to me like this is a reproductive strategy that's working quite handsomely for them. It kinda reminds me of C. elegans, which is a 95% self-fertilizing hermaphrodite, 5% male species; the males exist to jumble things up now and then. (And there are certainly plenty of species with infertile members, like social insects!)
Interestingly, there are ample parallels to be drawn in computing with various techniques for jiggling neural networks to get them out of local minima.
In the species question. I'm pretty sure that the content of the chromosomes is considered a factor as well. Wikipedia has an article on the species problem (if you aren't holding the answer behind your back, since you clearly know your Mendelian genetics!) which I am probably not yet qualified to comment on the reliability of. The hard truth, though, is that the word is archaic fluff, and that organisms fall in and out of style (mostly out) with each other all the time. A slightly better concept is this thing, but that has more to do with population flow than anything rightly concrete.
Bio questions? Ask me to start a Q&A journal. Computer analogies available for most topics!